Previous year MCQs

General science UPPSC 2000 GS-I
Question

What is the source of electric energy in an artificial satellite?

Answer & Solution

Answer: (Detailed Solution Below)

Option B: Solar cells

Detailed Solution:

The correct answer is “Solar cells”.
The primary source of electric energy in an artificial satellite is: (2) Solar cells

The main source of electric energy in an artificial satellite is solar cells, which convert sunlight into electricity. Solar cells are made of silicon and use the photovoltaic effect to convert light energy into electrical energy. When sunlight hits the cell, photons (light particles) bombard the upper surface and carry their energy down through the cell.

Similar Questions:

What is the function of the thermostat in a refrigerator?
  1. A) To lower the temperature
  2. B) To increase the freezing point
  3. C) To maintain constant temperature
  4. D) To decrease the melting point
Which of the following laser types is used in a laser printer?
  1. A) Dye laser
  2. B) Semiconductor laser
  3. C) Excimer laser
  4. D) Gas laser
"Pyrheliometer' is used for measuring:
  1. A) Sun spots
  2. B) Air temperature
  3. C) Solar radiation
  4. D) Temperature of plants
Neutron was discovered by:
  1. A) Chadwick
  2. B) Rutherford
  3. C) Bohr
  4. D) Newton
Which of the following is the correct order of plant species from higher to lower order?
  1. A) Class — Phylum — Order — Plant Kingdom
  2. B) Order — Class — Phylum — Plant Kingdom
  3. C) Class — Plant Kingdom — Phylum — Order
  4. D) Plant Kingdom—Phylum — Class — Order
First computer was made by
  1. A) Bill Gates
  2. B) Bill Clinton
  3. C) Charles Babbage
  4. D) Marconi
Isotopes are atoms of an element whose:
  1. A) atomic weight is same, but atomic number is different
  2. B) atomic weight different, but atomic number same
  3. C) atomic number and atomic weight are same
  4. D) none of these
The bacteria responsible for fixing nitrogen in Soyabean is:
  1. A) Rhizobium Leguminoserum
  2. B) Rhizobium japonicum
  3. C) Rhizobium phaseoli
  4. D) Rhizobium trifolii
Chemical name of limestone is?
  1. A) Calcium carbonate
  2. B) Magnesium chloride
  3. C) Sodium chloride
  4. D) Sodium sulphide
Blue baby syndrome is due to the presence of which of the following in the blood ?
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  2. B) Methemoglobin
  3. C) Lead
  4. D) Nitrate
Which of the following periods has generally been considered to be the 'Little Ice Age'?
  1. A) 730 A.D. - 850 A.D.
  2. B) 950 A.D. - 1250 A.D.
  3. C) 1650 A.D. - 1870 A.D.
  4. D) 8000 to 10,000 years B.P. (Before Present)
Given below are two statements, one is labelled as Assertion (A) and other as Reason (R) :

Assertion (A): Invert sugar is more sweeter than sucrose.
Reason (R) : Invert sugar is obtained by the hydrolysis of sucrose.

Select the correct answer from the codes given below.
Codes :
  1. A) Both (A) and (R) are true and (R) is the correct explanation of (A)
  2. B) Both (A) and (R) are true but (R) is not the correct explanation of (A)
  3. C) (A) is true but (R) is false
  4. D) (A) is false but (R) is true